I got the KD P7 Driver in March and it seem it's a new design from ones in September. There's no more thermal shutdown now. I ran it for 2 hours continuously, numerous times with no dimming in a Maglite 2c with no heatsink. It automatically shutoff when the voltage is too low (after 20 min of blinking). Although it get hot it work fine. I put a heatsink on it now though. I had an ealier version that runs on high for only 90 sec and then switch to medium (without heatsink).
It's available in 2 version: a 3 modes (high, med, low), and a 5 modes (low, med, high, strobe, sos). Both version looks exactly the same.